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Finding the Fourth Proportional to 828.68, 1,242.88 and 273.32

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Solution

The fourth proportional to 828.68, 1,242.88 and 273.32 is: 409.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.68 : 1,242.88 = 273.32 : x
  2. Step 2: Convert to fraction form
    828.68/1,242.88 = 273.32/x
  3. Step 3: Cross multiply
    828.68x = 1,242.88 × 273.32
  4. Step 4: Simplify right side
    828.68x = 339,703.96
  5. Step 5: Solve for x
    x = 339,703.96/828.68
  6. Step 6: Final answer
    x = 409.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.